CN1298259A - Video frequency decoding and channel trapping system - Google Patents

Video frequency decoding and channel trapping system Download PDF

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Publication number
CN1298259A
CN1298259A CN00128394A CN00128394A CN1298259A CN 1298259 A CN1298259 A CN 1298259A CN 00128394 A CN00128394 A CN 00128394A CN 00128394 A CN00128394 A CN 00128394A CN 1298259 A CN1298259 A CN 1298259A
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channel
data
program
video
user
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CN1222166C (en
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小罗伯特·N·赫斯特
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Thomson Licensing SAS
International Digital Madison Patent Holding SAS
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/004—Predictors, e.g. intraframe, interframe coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/23406—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving management of server-side video buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/23424—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving splicing one content stream with another content stream, e.g. for inserting or substituting an advertisement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4383—Accessing a communication channel
    • H04N21/4384—Accessing a communication channel involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/44016—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving splicing one content stream with another content stream, e.g. for substituting a video clip
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44213—Monitoring of end-user related data
    • H04N21/44222—Analytics of user selections, e.g. selection of programs or purchase activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/475—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data
    • H04N21/4755—End-user interface for inputting end-user data, e.g. personal identification number [PIN], preference data for defining user preferences, e.g. favourite actors or genre
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Social Psychology (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Databases & Information Systems (AREA)
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  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Marketing (AREA)
  • Human Computer Interaction (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

A digital video decoding system receives packetized video data representing programs conveyed on a plurality of video channels. The system includes a plurality of buffers (30, 50) for storing encoded video data representing images of video programs conveyed on a corresponding plurality of video channels. An individual buffer, corresponding to an individual video channel, stores sufficient encoded video data to prevent an underflow condition following switching to decode a program conveyed on the individual video channel. A processor (60) initiates switching to decode a program conveyed on a selected one of the plurality of video channels in response to a user channel selection input (70). A decoder (110) decodes encoded video data received from one of the plurality of buffers corresponding to the program conveyed on the selected video channel as determined by switching initiated by the processor. The decoder also predicts (130) a next channel to be selected by a user.

Description

Video coding and channel capture systems
The present invention relates to Digital Video System, relate in particular to the method for improved digital video receiver and receiving digital video signal.
Digital television system and receiver increase sharply in the past few years.Some examples comprise the system of DIRECTV, DVB (digital video broadcasting engineering) and ATSC (advanced television system committee) type.Because quite lot of data is relevant with video communication, so compression has become a part of go-go digital video application.
The standardization video-frequency compression method that Motion Picture Experts Group has defined a kind of MPEG of being called (Moving Pictures ExpertsGroup) image encoding standard is used for vision signal and image, hereinafter referred to as " mpeg standard ".Mpeg standard comprises a system coding part (ISO/IEC 13818-1, on June 10th, 1994) and a video coding part (ISO/IEC 13818-2, January 20 nineteen ninety-five).Adopted the form of packet data streams, this packet data streams to generally comprise the data content (for example, corresponding to cable television channels 1-125 content) of many program channels according to the mpeg standard coded data.Mpeg standard uses in the frame and inter-frame coding obtains required compression.In the intraframe coding of a picture frame, a frame is divided into a plurality of block of pixels (being called macro block) and uses a kind of discrete cosine transform (DCT) to compress each piece.In the interframe encode of a picture frame, use motion compensation (MC) technology encoded image frame difference in advance obtains another kind of data compression.
The frame of three kinds of main types that relate in the mpeg image coding is interframe encode (I) frame, predictive coding (P) frame and bi-directional predictive coding (B) frame.The data that the I frame provides access point at random not use any other frame in data flow (presentation video sequence) and to the decoding and the reconstruct of independent I frame.The data from the P frame (anchor (anchor) frame) of previous I frame or use motion estimation techniques are used in the reconstruct of P frame.The reconstruct of B frame is used from the data of previous and I future and P anchor frame and may be related to and the not homotactic processed frame data of frame sequence that receive.Can obtain the significant data compression by this way, because the B frame for example only needs about 11% of I frame desired data.
Digital television receiver as requiring compatible those with DIRECTV, DVB and ATSC, may take long program capture time unfavourably after the channel change that the user starts.For example, the user selects new channel (and relevant signal source) and the channel selected on time between the initial demonstration of new program may add up to several seconds.The sequence of this required capturing events before can being acquired, handling and showing owing to data flow to small part.Especially, catching of channel change and new program may require to discern and use in the new packed data stream of selecting a program on the channel of expression one inlet point at random.In addition, if the new channel of selecting is in the data flow of launching on a different transponder or the RF channel, then channel change may need to repeat phase-locked and equalization operation.In addition, after this phase-locked and equalization operation, need obtain transmission stream (TS) program map customizing messages of auxiliary system and reception.This system and Program Specific Information be analyzed, contrast and compilation are used to discern for useful form and each packet of collecting to recover newly to select the program on the channel.This Program Specific Information also comprises program guide, conditional access, the network information and the identification and the link data that system tuning can be arrived required channel.In case Program Specific Information has been acquired and has collected then it is used to discern and obtain and comprises one in new each packet of selecting the program that transmits on the channel.Each packet that comprises program on the new selection channel is buffered to requiring compatiblely mutually with the video buffer verifier (VBV) of mpeg compatible, and sequence-header and I frame are identified so that provide a suitable inlet point for subsequently processing and demonstration.
System of the present invention reduce the delay that when channel change, produced and will be any relevant make the user offending watch disturbing reduce to minimum.
The packet video data of the program that transmits on a plurality of video channels of a kind of digital video transcoding system's reception expression.This system comprises a plurality of buffers, is used for the coding video frequency data of the video frequency program image that storage representation transmits on corresponding a plurality of video channels.Corresponding to the independent buffer of an independent video channel, store enough coding video frequency datas and prevent underflow condition after the program conversion that on the independent video channel of decoding, transmits.Processor, the response user channel is selected input, starts the conversion of the program that transmits on the selected channel in a plurality of video channels to decoding.Decoder is determined as the conversion that processor starts, decipher corresponding to the selection video channel on the coding video frequency data of a reception from a plurality of buffers of the program that transmits.According to (a) predetermined user channel and program prioritization criteria, (b) predetermined user channel navigation pattern, or (c) user data input unit perception data, decoder is also predicted the succeeding channel of being selected by the user.
This system can realize the bumpless transfer between a plurality of video frequency programs, and each program transmits on corresponding of a plurality of video channels respectively.This system can use at least one memory coding video frequency data of the image of a plurality of video frequency programs of storage representation simultaneously.For the enough coding video frequency data of each storage of a plurality of video frequency programs to prevent the situation of underflow.In case starting, the user is converted to one that selects in a plurality of video frequency programs of decoding, then decoded corresponding to selecting one the coding video frequency data of being stored in a plurality of video frequency programs.
Fig. 1 illustrates double buffering MPEG decoder of the present invention.
Fig. 2 illustrates first embodiment of the receiver of the double buffering MPEG decoder that uses Fig. 1.
Fig. 3 illustrates second embodiment of the receiver of the double buffering MPEG decoder that uses Fig. 1.
System of the present invention uses a plurality of tuners, so that work as a tuner for the treatment of current with demonstration Program the time another tuner be used for to obtain other program. Yet, because fringe cost and related Decoder set up and initialized delay, do not wish to use be exclusively used in that picture-in-picture (PIP) uses second complete Whole tuner and decoder group.
According to the present invention, change relevant undesirable delay with user channel and can pass through in advance buffer memory one Individual data flow reduces significantly, and this data flow comprises the program of selecting channel to transmit new. Especially, Buffer memory has reduced and obtains in the new data stream I frame and catch enough data and fill up buffer and make it to reach in advance Arrive the delay of the VBV buffer occupancy level of mpeg compliant. By in advance buffer memory input data, one Dawn, the user started channel change, can obtain to be filled to for I frame inlet point and the buffer selected Required MPEG occupancy level. Independent buffer in the FIFO can be used for the current sight of storage expression See program first data flow data and be used for the storage expression and select according to the user channel variance command Another channel on the data of second data flow of program. When finishing such channel change, be Possible I frame is used as in the new selection of system controller (such as the unit 60 of Fig. 1 to Fig. 3) the record channel data stream The new inlet point of selecting a program on the channel. When the conversion program channel, use the bit stream splicing also And identify a suitable exit point (for example, lucky current frequency in first buffer of an anchor frame front A point of track data). After detecting stomion, from the entrance of previous record with FIFO begin Two buffers are realized channel switch by the new data of program on the channel of selecting of guiding expression.
Expression is sent to one according to the data flow of program on the succeeding channel of channel change command selection Auxiliary VBV buffer is used for following entering and export. The enough data of auxiliary VBV buffer storage with Prevent buffer underflow, it comprises that at least one I frame is as the suitable inlet point according to channel change. When the user wished to be transformed into succeeding channel, of the VBV buffer that switching controller identification activates was suitable When exit point, and the suitable inlet point of formerly identifying and recording is with the buffer output that activates The auxiliary cache device is changed in circulation.
Because the quantity of the position of each frame may be different in satisfying the stream of MPEG, so the independently mpeg stream of program can have problems on synchronous two expression different channels.Yet this can realize to store buffer and use splicing pointer by loading two bit streams.These pointers are commonly referred to as splicing inlet point and/or exit point.Should be realized that these buffers will fill up and empty as the function of time respectively, and the data volume in specific register is in any particular point in time dynamic change.During program decoding, the buffer that receives each buffer of a data flow takies and can almost fill up variation from almost emptying.Therefore, the underflow situation may occur in from the data of a buffer and flow to the splicing of another data flow of another buffer.A kind of like this splicing changed inlet point and the exit point that uses prior record, and they are for example to discern at the anchor I frame of group of picture (GOP) beginning as suitable transfer point.By using this splicing switching mechanism between the double buffering program data stream that dual tuner level (or the single tuner level another embodiment) obtains, make the channel change number of times be reduced to about a few frame or still less valuably.
Referring now to accompanying drawing, (identical reference number is represented components identical of the present invention among the wherein different figure), Fig. 1 illustrates a double buffering MPEG decoder 10 of the present invention.In the system of Fig. 1, comprise that one or more main data flow 20 that comprise the basic stream of independent program are input to a VBV buffer 30.Comprise that one or more auxiliary data flows 40 that comprise the basic stream of another program are input to the 2nd VBV buffer 50.Control the operation of VBV buffers 30 and the 2nd VBV buffer 50 respectively by control signal 84 and 82 in response to the control device 60 of user's control data 70 (as user command).Decoder 10 comprises a switch 100, and this switch has a first input end that is coupled to a VBV buffer 30 outputs, and second input that is coupled to the 2nd VBV buffer 50 outputs.Switch 100 operations are arrived decoding unit 110 with of connecting in buffer 30 and the buffer 50.MPEG code translator 110 is finished the MPEG decoding of the routine that is provided to its input end signal, and does not comprise the VBV buffer in this embodiment.In another embodiment, decoder 110 can comprise buffer and switch element such as unit 30, unit 50 and unit 100.Switch 100 is in response to the control signal 90 from control device 60 outputs.For example, the output of code translator 110 can be provided to additional circuit (not shown) in a usual manner and is for further processing and uses display unit 120 to reproduce.
The key data stream 20 of expression program is normally deciphered, and when expection received the control signal 70 of channel (and program) change request that produces corresponding to the user, the auxiliary data flow 40 of expression program was stored in the 2nd VBV buffer 50 simultaneously.The system of Fig. 1 makes the user can change channel with the delay that reduces valuably and watches interference to reduce to minimum with unfavorable.In case main data flow 20 and auxiliary data flow 40 are cached to the VBV occupancy level of enough mpeg compatible, then they can be coupled to code translator 110 from buffer 30 and buffer 50 respectively through switch 100.The cofeature stream 40 that comprises the programme content of the required channel of user is buffered in the unit 50 in advance, and can be handled by unit 110 when finishing the channel change of user's startup by user control signal 70.This in advance buffer memory reduced valuably in order to obtain enough data and fill up buffer 50 and make it to reach a predetermined VBV and take an in addition related undesirable delay of level.The channel change that obtains is seamlessly realized in several frames.
The system that should note Fig. 1 uses the MPEG splicing to finish the channel change of conversion between data flow buffer 30 and the data flow buffer 50.By comparison, this splicing is applied to a plurality of independent formation streams are created a single generated data stream routinely, is used for as insert the application of commercial advertisement at the broadcast program multiplexed data stream.In addition, be contemplated to buffer memory in advance (for example in buffer 50) that the user starts the program data stream of channel change order valuably by use a prediction scheme in advance for example a second or a few second the predictive user next one will select which program channel to finish.In another embodiment, a plurality of buffers such as buffer 50 are used for storing simultaneously the data flow corresponding to a plurality of program channels.This has increased channel change that data cached in advance stream can start according to the user possibility by unit 110 decodings.If the channel that the user selects is not a channel of buffer memory in advance, then program is caught and is allowed with slowing down once more and may comprising the people is offending to watch interference.On the other hand, all program data streams of all the available program channels that may select corresponding to the user (on all available RF channels and from all transponders) can be buffered in the buffer as buffer 50 (for not shown for the purpose of clear in keeping figure) in advance.In this case, the program on all channels is produced the data flow of single and a plurality of expression programs by the while demodulation.A plurality of program data streams are gone to be multiplexed as the data flow (as data flow 20 and data flow 40) of single expression program, and the data flow of each expression program is cached in the corresponding VBV buffer.This guaranteed corresponding to the data of the program channel of new selection can according to the channel change that the user starts decipher and can make channel change with stand-by period of reducing promptly at several frames or still less seamlessly realized in the time.
In the system of Fig. 2, receiver 200 uses the double buffering MPEG decoder of before describing 10 in Fig. 1.Receiver 200 comprises a double buffering MPEG decoder 10 and a tuner and removes multiplexer 140.Go multiplexer 140 to receive and export the input that is coupled to the 2nd VBV buffer 50 from the input of a signal source (RF antenna) 150 and the input and second that provides first output to be coupled to a VBV buffer 30.On the other hand, various other signal sources that can use in Fig. 2 system comprise for example satellite, internet and cable television source.Receiver 200 also comprises predicting unit 130, be used for according to following 3 one or more: (a) predetermined user channel and comprise the channel of user preferences and the program prioritization criteria of program data, (b) the user channel navigation mode of precedence record and analysis and command selection pattern, and (c) by being positioned at the user data input unit, the perception data that provides of the transducer on remote controller, keyboard or other data input devices for example, the next program channel that predictive user is selected.The data of this perception are provided by the capacitive pick-up (or transducer of infrared or other types) that is positioned on the remote controller, for example, be used to indicate the user to point (or other drive units) on keyboard to path that degree of closeness and user's finger of a specific button may be followed the tracks of.
In addition, the extrapolation of user's succeeding channel being selected according to the navigation mode of precedence record may comprise that for example the use of " increasing progressively program " key/order of the current program of prediction acquisition is recycled and reused for the selection succeeding channel probably.Similarly, the use that obtains " program successively decreases " key/order of current program is recycled and reused for the selection succeeding channel probably.Equally, the use of " previous program " key/order (or program " exchange " or " redirect " key/order) is recycled and reused for the selection succeeding channel probably.More generally, the use that obtains the navigation key/order of current program is recycled and reused for the selection succeeding channel probably.Similarly, it is the succeeding channel that will select that the user model that replaces between program (no matter by what means) causes previous channel probably.
Each item of information of user priority criterion, navigation mode and perception data (in the above (a) and (b) and (c) in item of information) can be used for predictive user with the next program channel of selecting.On the other hand, one or more items of information can be finished probability analysis with the succeeding channel of predictive user with selection in the use combination.Predicting unit 130 receives from the user's of data input device (for not shown for the purpose of clear in keeping figure) actual channel select command 70 and perception data and from the item of information (a) of system controller (also for clear in keeping figure for the purpose of not shown) and (b).Unit 130 is provided to tuner with a tuner control signal 160 and removes multiplexer 140 and a command signal 170 is provided to control device 60.It is ready that the order 170 (from unit 130) of the succeeding channel of device 60 response notice predictions changes the user channel of a VBV buffer 30 and 50 pairs of expectations of the 2nd VBV buffer.Especially, unit 60 response commands 170 order the 2nd VBV buffer 50 storage channel data signals (from unit 140), this signal combination the program data of succeeding channel of the expectation selected of user.
Main data flow 20 and auxiliary data flow 40 unit 140 analyze and go multiplexed after, be provided to a VBV buffer 30 and the 2nd VBV buffer 50 respectively.The transmission stream that the mpeg compatible that provides from antenna 150 is provided for unit 140 with identification comprise current watch program on the program channel each flow substantially.In addition, unit 140 response command signals 160 program on the transmission stream that provides from antenna 150 comprises prediction with identification the next program channel is provided each flow substantially.The embodiment of Fig. 2 uses single tuner in the unit 140 valuably and goes multiplexer to analyze and to guide current and the succeeding channel data arrive buffer 30 and buffer 50 respectively.The next program data of the succeeding channel that unit 140 guiding are estimated arrive buffer 50, the decoded and demonstration of current first program of watching simultaneously.Yet if the next program of prediction is on another RF channel, user channel changes and may relate to owing to catch with processing delay irritating and watch interference.Especially, obtain at the program data that transmits on the different RF channel and may need unit 140 to repeat phase-locked and equilibrium treatment and obtain, the collect auxiliary system and the program information specific of the transmission stream (TS) that is used for transmitting on the different RF channel.This system and program information specific be used to discern and each packet of collecting to recover newly to select the program on the channel.In another embodiment, second tuner is used for obtaining simultaneously, separate to be in harmonious proportion deciphering the data that for example transmit from another transponder on different RF channels.This eliminated valuably obtain the related channel change of the program that transmits on the different RF channel relevant catch processing delay and allow quite fast and seamlessly channel switch to reduce the irritating interference of watching.
In the system of Fig. 3, receiver 300 has comprised the double buffering MPEG decoder 10 different with the receiver 200 of Fig. 2, and it comprises the first tuner 140A and the second tuner 140B, has replaced the tuner of Fig. 2 and has removed multiplexer 140.The second tuner 140B allows to comprise one or more data flow 40 uses the 2nd VBV buffer 50 buffer memorys that comprise the basic stream of program.Therefore, during unit 140A and unit 30 processing first data flow 20, second data flow 40 of expression program can be obtained simultaneously, separate is in harmonious proportion decoding to be stored in the buffer 50, and second data flow 40 is different from transmission in the transmission stream different on the different RF channel of first data flow 20 at one.When selecting channel to be used for being buffered in unit 30 and unit 50 with relevant program, tuner-go multiplexer 140A and 140B respond control signal 160A and the 160B from unit 130 respectively.
In case the decoding data from a VBV buffer 30 is transformed into the data in the 2nd VBV buffer 50, preferably first frame that occurs from second buffer is an I frame and enough data is arranged to avoid the VBV underflow buffer 50.In addition, in image sets (GOP) data structure of a closure of decoding, preferably this I frame begins GOP and is another P or I anchor frame from second frame that buffer occurs.Notice that GOP is with GOP start of header of following the I frame and extend up to next GOP title.The GOP of an opening comprises the frame with reference to a frame reconstruct among another GOP.Especially, among the GOP of an opening B frame between an I frame and next anchor frame.In the operation of Fig. 3 system, it is analyzed and be stored in the buffer (in the buffer 30 or 50, also being not used in that of the current stream that shows subsequently) to be included in the data of the program on the succeeding channel of prediction.When detecting an I frame in the data of the program that transmits on the succeeding channel that is comprising prediction, its position is recorded.The quantity of the position of next the anchor frame that arrives and the B frame of insertion also is recorded.In addition, quantity and any B frame that inserts subsequently that comprises the position of an I frame is counted and is separated record.
When reaching enough data avoiding the underflow situation and to support decoding when (as being determined by VBV mode parameter and position counting), the position of an I frame becomes inlet point, replaces the inlet point position of any precedence record.The inlet point reservation of this record receives enough data with after preventing the underflow situation as inlet point up to new hereto I frame, till the inlet point of its quilt I frame subsequently upgrades.
In case the channel change order 70 that the user starts is through unit 130, unit 60 uses splicing with conversion between buffer 30 and buffer 50 in guidance unit 100.In vectoring information before for example buffer 50 arrives MPEG decoders 110 from the auxiliary cache device through switch 100, unit 60 is waited for till what a anchor frame (exit point) just is before for example buffer 30 occurs from current VBV buffer.Unit 60 guiding comprise that the data of the inlet point I frame of precedence record arrive decoder 110 from buffer 50 through switch 100.After this program channel conversion, auxiliary VBV buffer 50 is as current program channel VBV buffer operation.Previous buffer is that buffer 30 becomes the data that the auxiliary cache device is used to receive the succeeding channel that comprises unit 130 predictions subsequently in this example.Unit 60 can guidance unit 50 and unit 100 jump to next anchor frame and omit the B frame that inserts to improve decoder operation and as the visible conversion between program channel that requires.By skipping in the time reference that the B frame produces any such redirect by unit 60 records.
Though adopted some specific preferred form the present invention has been described, but should be appreciated that the open of currently preferred forms only is as an example, do not deviate from the spirit and scope of the present invention of following claims record making many variations aspect CONSTRUCTED SPECIFICATION, combination and the parts arrangement.By statement suitable in the claims, present patent application will cover that all possess the feature of patentability among disclosed the present invention.

Claims (21)

1. one kind is used to receive the digital video transcoding system that transmits the packet video data of program on a plurality of video channels of expression, it is characterized in that:
A plurality of buffers, the coding video frequency data that is used for the video frequency program image that transmits on the corresponding a plurality of video channels of storage representation, wherein, prevent underflow during with transmission program on being converted to the described independent video channel of decoding corresponding to one of the independent video channel independent enough coding video frequency data of buffer storage:
Processor is used for selecting input according to user channel, starts conversion, the program that transmits on one of selected in described a plurality of video channels with decoding; And
Decoder, the conversion that is used for processor startup as described is determined, and decoding is corresponding to the coding video frequency data from the reception of one of described a plurality of buffers of the described program that transmits on the described selected video channel.
2. the system as claimed in claim 1 is characterized in that, responds the conversion that described processor starts, and described decoder adopts the splicing constraint in the conversion of the described program that transmits on the channel of selecting to the described user of decoding.
3. system as claimed in claim 2, it is characterized in that, described splicing constraint comprises at least one in following: (a) begin to decipher program data on the described user selected channel at the anchor I frame of the mpeg compatible of described program data, (b) before beginning to decipher, abandon B frame among the GOP of program data on the described user selected channel, and (c) before the described current GOP anchor frame of watching program, be transformed into program data on the described user selected channel of decoding from deciphering the current program of watching immediately.
4. the system as claimed in claim 1 is characterized in that described a plurality of buffer comprises that be used for can be by the buffer of the appointment of each channel of described decoder for decoding.
5. the system as claimed in claim 1 is characterized in that, a plurality of tuners can be stored coding video frequency data from first tuner at first buffer and decipher the coding video frequency data that obtains from second tuner simultaneously.
6. the system as claimed in claim 1 is characterized in that, during described coding video frequency data that described decoder receives one of in described a plurality of buffers in decoding, rearranges data to be provided at the decoding data in the different images sequence.
7. the system as claimed in claim 1, it is characterized in that the coding video frequency data of reception that prediction processor is used for next video channel that predictive user will select and is used for transmitting on described next video channel of indication program is to of described a plurality of buffers.
8. system as claimed in claim 7, it is characterized in that, described prediction processor is according in following at least one: (a) user channel is watched historical characteristics, (b) program of user preferences/channel criterion, (c) user interface navigation command, and (d) user interface senses input data, predict described next video channel.
9. system as claimed in claim 8 is characterized in that, described watch historical characteristics comprise following at least one: (a) use the channel frequency of data, and the channel duration of (b) using data.
10. digital video transcoding system that is used to receive the packet video data of the program that transmits on a plurality of video channels of expression is characterized in that:
A plurality of buffers (30,50) are used for the video data of the coding of the video frequency program image that storage representation transmits on corresponding a plurality of video channels;
Prediction processor (130), the coding video frequency data of reception that is used for predicting next video channel of being selected by the user and is used for transmitting on described next video channel of indication program is to of described a plurality of buffers:
Processor (60) is used to respond user channel and selects input, starts the conversion of the program that transmits on described next video channel to decoding; And
Decoder (110), it is determined to be used for the conversion that processor as described starts, and decoding is corresponding to the coding video frequency data that receives one of from described a plurality of buffers of the described program that transmits on described next video channel.
11. system as claimed in claim 10, it is characterized in that, described prediction processor is according in following at least one: (a) user channel is watched historical characteristics, (b) program of user preferences/channel criterion, (c) user interface navigation command, and (d) user interface senses input data, predict described next video channel.
12. system as claimed in claim 11 is characterized in that, described watch historical characteristics comprise following at least one: (a) use the channel frequency of data, and the channel duration of (b) using data.
13. a method that is used for sequentially showing a plurality of video frequency programs, each program transmit on corresponding one in a plurality of video channels respectively, described method is characterised in that:
Utilize at least one memory coding video frequency data of the image of the described a plurality of video frequency programs of storage representation simultaneously, wherein for the enough coding video frequency datas of each storage in described a plurality of video frequency programs, to prevent the underflow situation after using up described at least one memory data;
Detect user's input;
Respond described user input, start conversion one of selected in the described a plurality of video frequency programs of decoding; And
Decoding is corresponding to the coding video frequency data of described storage one of selected described in described a plurality of video frequency programs.
14. method as claimed in claim 13 is characterized in that, the described step that starts conversion is included in conversion one of selected described in the described a plurality of video frequency programs of decoding and adopts the splicing constraint.
15. method as claimed in claim 14, it is characterized in that, adopt the described step of splicing constraint to comprise one of the following step at least: (a) to begin the anchor I frame deciphered at mpeg compatible video data corresponding to the encryption of the video frequency program of described selection, (b) before beginning to decipher, abandon, and (c) before the described current image sets anchor frame of watching program, be transformed into the described selected video frequency program of decoding from deciphering the current program of watching immediately corresponding to the B frame in the image of video data group of described selected video frequency program.
16. method as claimed in claim 13, its feature also is:
Utilize a plurality of tuners to receive corresponding a plurality of video channel simultaneously;
Storage from the coding video frequency data of first tuner of described a plurality of tuners to first buffer of selecting from described at least one storage arrangement; And
Decipher the coding video frequency data that obtains from second tuner of described a plurality of tuners selections simultaneously.
17. method as claimed in claim 13 is characterized in that, the described step of deciphering the coding video frequency data of described storage comprises select in the coding video frequency data of rearranging described storage one to be provided at the decoding data in the different images sequence.s
18. method as claimed in claim 13, its feature also is, next video channel that prediction is selected by the user, wherein the described step of the coding video frequency data of the image of the described a plurality of video frequency programs of storage representation comprises that storage representation is corresponding to the coding video frequency data of the image of the video frequency program that transmits on next video channel of described prediction simultaneously.
19. method as claimed in claim 18, it is characterized in that, the described step of described next video channel of prediction one of comprises the following steps at least: determine that (a) user channel watches historical characteristics, (b) determine the program/channel criterion of user preferences, (c) determine the user interface navigation command, and the input data of (d) determining user interface senses.
20. method as claimed in claim 19 is characterized in that described to watch historical characteristics to comprise at least one of following: (a) use the channel frequency of data, and the channel duration of (b) using data.
21. one kind is used for it is characterized in that comprising step in the method for the digital video transcoding system prediction that receives the packet video data that transmit program on a plurality of video channels of expression by the succeeding channel of user's selection:
Collection is used to predict the information that succeeding channel is selected, and it is one of following at least that described information comprises: (a) predesignated subscriber's channel and program prioritization criteria, (b) predesignated subscriber's channel navigation pattern, and (c) user data input unit perception data;
Determine that according to the probability that the information from described collection obtains the information of handling described collection is to discern the channel that a user may select;
In described a plurality of video channels, adopt the succeeding channel of the channel of described identification as described prediction.
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